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Article #32164Re: ST hardware scrolling
From: Mike Gore, Institute Computer Re...
Date: Wed, 27 Apr 1988 17:49
Date: Wed, 27 Apr 1988 17:49
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1396 bytes
My 2 cents to do 'hardware' scrolling would be to do it partly in software and hardware. If we were to use the horizontal interrupt we could maintain a linked list of scan lines - or even a group of scan lines. This could be run as a interrupt driven display process that would then be a set up as a display list of sorts. In order to scroll the entry link for the beginning of the display would only need to be changed. If a group of scan lines were used to make up a single character line interrupt Overhead could be reduced and character I/O would be slightly easier. The disadvantage to this method would be the waisted space at the end of each line [ required to fall on 256 byte offsets ] and interrupt overhead. Comments ??? # Mike Gore # Institute for Computer Research. ( watmath!mgvax!root - at home ) # These ideas/concepts do not imply views held by the University of Waterloo.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watmath!watdcsu!magore From: magore@watdcsu.waterloo.edu (Mike Gore, Institute Computer Research - ICR) Newsgroups: comp.sys.atari.st Subject: Re: ST hardware scrolling Message-ID: <4650@watdcsu.waterloo.edu> Date: 27 Apr 88 17:49:27 GMT References: <544@csvax.liv.ac.uk> <4484@batcomputer.tn.cornell.edu> Reply-To: magore@watdcsu.waterloo.edu (Mike Gore, Institute Computer Research - ICR) Organization: U. of Waterloo, Ontario Lines: 18